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|
package flags
import (
"flag"
"fmt"
bpf "github.com/aquasecurity/libbpfgo"
)
type Flags struct {
UidFilter int
PidFilter int
EventMapSize int
}
func New() (flags Flags) {
flag.IntVar(&flags.UidFilter, "uid", 0, "Filter for user ID")
flag.IntVar(&flags.PidFilter, "pid", 0, "Filter for processes ID")
flag.IntVar(&flags.EventMapSize, "mapSize", 4096*16, "BPF FD event ring buffer map size")
flag.Parse()
return flags
}
func (flags Flags) SetBPF(bpfModule *bpf.Module) error {
if err := bpfModule.InitGlobalVariable("UID_FILTER", uint32(flags.UidFilter)); err != nil {
return fmt.Errorf("unable to set up UID_FILTER global variable: %w", err)
}
if err := bpfModule.InitGlobalVariable("PID_FILTER", uint32(flags.PidFilter)); err != nil {
return fmt.Errorf("unable to set up PID_FILTER global variable: %w", err)
}
return nil
}
func (flags Flags) ResizeBPFMaps(bpfModule *bpf.Module) error {
if err := resizeBPFMap(bpfModule, "event_map", uint32(flags.EventMapSize)); err != nil {
return fmt.Errorf("event_map: %w", err)
}
return nil
}
func resizeBPFMap(module *bpf.Module, name string, size uint32) error {
m, err := module.GetMap(name)
if err != nil {
return err
}
if err = m.SetMaxEntries(size); err != nil {
return err
}
if actual := m.MaxEntries(); actual != size {
return fmt.Errorf("map resize to %d failed, expected %v, actual %v", size, size, actual)
}
return nil
}
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